Malicious PDF — malware analysis report

Static analysis result for SHA-256 e096e130de6f0c4d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f21b0f80ee169c281ac16202895a3f48 SHA-1: 7601028201ae9734b2997f16b9d18ef4b7bd66b6 SHA-256: e096e130de6f0c4dfba935fb5844c4c13ff4e9de5b105cceb2626865d853e20e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to various domains, suggesting it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to distribute traffic across many disposable hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a9e848fa463d072087efec11713150b9/56830806431.pdf In PDF document text
    • http://esistore.be/userfiles/file/79787402631.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/mibomimize.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/tuvupexusadokosuvizogev.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/55512675441.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/61518357006.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/zitufun.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/41282665124.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/konirexidofe.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/juzarijulokimoji.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe717e7edf---6502565141.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sulikevodemarezimud.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/97409531702.pdfIn PDF document text
    • http://yanartextil.com/firma/files/sibenereviroxe.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/teguki.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/90122994625.pdfIn PDF document text
    • http://turnyras.lt/Files/file/67854197699.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/44626687770.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/1612055463.pdfIn PDF document text
    • http://machulski.com/public/file/84497461493.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wosek.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/75174449787.pdfIn PDF document text
    • http://telecycling.info/files/file/pifokozagomokowuvubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=smash+colors+3d+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 19504 bytes
SHA-256: ad9f202531d029ccac28ee4db67583eac5cfe58d54475fc78f791c01f2399488
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 10456 bytes
SHA-256: 0d33db8452b9fd9fd441c572781af86de85a85c44e69e09516f4f36396ad3888

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